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Cash, Cash Equivalents, and Investments - Components of Cash, Cash Equivalents, and Investments (Detail) - USD ($) $ in Thousands | Jul. 01, 2018 | Dec. 31, 2017 | Jul. 02, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Cash | $ 124,147 | $ 97,951 |  |
Money market instruments | 5,055 | 8,631 |  |
Cash and cash equivalents | 129,202 | 106,582 | $ 68,266 | $ 79,641
Short-term investments | 353,740 | 297,961 |  |
Long-term investments | 271,941 | 423,441 |  |
Total | 754,883 | 827,984 |  |
Treasury Bills |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 136,377 | 150,371 |  |
Long-term investments | 0 | 23,459 |  |
Corporate Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 116,347 | 47,395 |  |
Long-term investments | 208,454 | 296,014 |  |
Asset-Backed Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 55,240 | 59,203 |  |
Long-term investments | 47,740 | 71,727 |  |
Sovereign Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 7,375 | 21,579 |  |
Long-term investments | 8,971 | 13,147 |  |
Agency Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 29,247 | 10,608 |  |
Long-term investments | 5,934 | 14,890 |  |
Municipal Bonds |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments | 9,154 | 8,805 |  |
Long-term investments | $ 842 | $ 4,204 |  |

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- Definition Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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- Definition Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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